Chapman-Enskog-Wilke-Lee model

Chapman-Enskog-Wilke-Lee model (72). The correlations for the mass transfer coefficients are taken from Ref. 194. 

Effective diffusivities were used for the calculation of the mass-transfer coefficients. In contrast to the binary Maxwell-Stefan diffusivities, the effective diffusivities were calculated via available procedures in ASPEN Custom Modeler , whereas the Wilke-Chang model was used for the liquid phase and Chapman-Enskog-Wilke-Lee model for the vapor phase [94]. In the full model, computationally intensive matrix operations for the Maxwell-Stefan equations are necessary. The model has been further extended to consider the presence of liquid-liquid separation [110, 111]. 

D ij (p=0) is the low pressure binary diffusion coefficient obtained from the Chapman-Enskog-Wilke-Lee model. The molar volume and the molar density are calculated with an equation of state model. 

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